Light burned grades

The temperature at which the magnesium oxide is calcined is important for its performance in rubber. The calcined MgO product must have sufficient activity to be an effective acid acceptor for use in halogenated elastomer compounds. The light burned grades that are calcined between 700 and 1000 °C usually work well for rubber applications. 

Properties Colorless crystals or white powder. Sp. gr. 3.244 at 23°. M. P. 575°. Gives green light on burning. Grade A (99.8 per cent purity) for use in priming compositions. Grade B (99.0 per cent purity) for use in pyrotechnic compositions. 

The production of chemical-grade magnesia or light-burned MgO requires careful control of the calcination temperature to achieve the required specific surface area of the finished product. A furnace well suited to this requirement is the multiple-hearths Herreshoff-type. For the production of dead-burned magnesia typically shaft or rotary kilns are employed. See Chapter 5 for furnaces used in MgO production. 

A variety of furnaces are used in the magnesia industry to calcine either magnesite or magnesium hydroxide filter cake. The most commonly used are the multiple-hearth furnace (MHF) and rotary and shaft kilns. MHFs are primarily used to produce reactive lightly calcined magnesia, while rotary and shaft kilns produce hard and dead-burned grades of magnesia. 

MagChem 40 Light Burned Technical Grade Magnesium Oxide ... 

The majority of today s turbines arc fueled wth natural gas or No. 2 distillate oil. Recently there has been increased interest in the burning of nonstandard liquid fuel oils or applications where fuel treatment is desirable. Gas turbines have been engineered to accommodate a wide spectrum of fuels. Over the years, units have been equipped to burn liquid fuels, including naphtha various grades of distillate, crude oils, and residual oils and blended, coal-derived liquids. Many of these nonstandard fuels require special provisions. For example, light fuels like naphtha require modifications Co the fuel handling system to address high volatility and poor lubricity properties. 

No. 4 fuel oil a light indnstrial heating oil and is nsed where preheating is not required for handling or burning there are two grades of No. 4 fuel oil, differing in safety (flash point) and flow (viscosity) properties. 

This is the case of a monophthalmic left eye patient wounded by a grade 4 burn due to a strong base. Two TK have not succeeded because of successive rejections. The visual acuity of the left eye was reduced to a good localization of the light. The cornea was white. 

Acrylics burn with a light steady flame accompanied by little smoking. Higher molecular cast sheets drip slightly, while the injection grades of lower molecular mass burn with dripping. 

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